-12a-9a-(-11a)=20

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Solution for -12a-9a-(-11a)=20 equation: 


Simplifying
-12a + -9a + -1(-11a) = 20

Remove parenthesis around (-11a)
-12a + -9a + -1 * -11a = 20

Multiply -1 * -11
-12a + -9a + 11a = 20

Combine like terms: -12a + -9a = -21a
-21a + 11a = 20

Combine like terms: -21a + 11a = -10a
-10a = 20

Solving
-10a = 20

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by '-10'.
a = -2

Simplifying
a = -2

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